This is similar to the so-called. the prisoner's dilemma, a concept from Game Theory, the essence of which is that players will not always cooperate with each other, even if it is in their best interest. It is assumed that the player / prisoner will maximize his own gain / will act exclusively in his own interests, not caring about the benefit / freedom of others.
If you meet your identical "I" from a parallel universe, most likely an act of love will occur only if the lot is cast who will be the first to dominate. And if you yourself agree to such a solution to the issue, then 100% parallel "I" will agree.
Just like anyone else who wants to fuck you. If you are a homosexual, then you probably already have experience of contacts of varying degrees with fellows. But it is not at all obvious that you from a parallel world will also be homosexual. It may well be that you want him, and at this moment he will celebrate the parallel universal day of the Airborne Forces, for example.